The invention belongs to the technical field of heat radiators of engines or generators, and particularly relates to an active intelligent temperature control heat radiator. The active intelligent temperature control heat radiator comprises an upper water chamber, a lower water chamber and an engine starting switch, and a water inlet temperature control probe and a water outlet temperature control probe are arranged on a water inlet of the upper water chamber and a water outlet of the lower water chamber respectively. The water inlet temperature control probe and the water outlet temperature control probe are connected with a first temperature control instrument outside the water chambers, a refrigeration water pipe with the two ends stretching out of an upper end plate of the upper water chamber is arranged in the upper water chamber, a liquid nitrogen refrigeration set is connected between the two ends of the refrigeration water pipe, a heating pipe is arranged in the lower water chamber, a heating head is arranged in the heating pipe, a heating unit is connected to the heating head, and the first temperature control instrument is respectively and electrically connected with the liquid nitrogen refrigeration set, the heating unit and the engine starting switch. The active intelligent temperature control heat radiator can achieve automatic heating and temperature reduction, can adapt to large-span temperature difference changes of the severe environment and can be normally used under the high-temperature environment and the low-temperature environment.